docs: def _check_lambda_alias(self):
          """Check if lambda alias exists.
  
          Returns:
              True if alias exists
              False if alias does not exist
          """
          aliases = self.lambda_client.list_aliases(FunctionName=self.app_name)
  
          matched_alias = False
          for alias in aliases['Aliases']:
              if alias['Name'] == self.env:
                  LOG.info('Found alias %s for function %s', self.env, self.app_name)
                  matched_alias = True
                  break
          else:
              LOG.info('No alias %s found for function %s', self.env, self.app_name)
          return matched_alias